For those interested in the potential for mapping via kite or balloon, here is a new site, which includes links for related hardware and software: http://wiki.grassrootsmapping.org/show/HomePage

For more in-depth discussion of KAP (kite aerial photography), see http://www.arch.ced.berkeley.edu/kap/

Nathan Craig\’s lab at Penn State also has a lot of info on KAP for archaeology: http://www.personal.psu.edu/nmc15/blogs/anthspace/